Idaho Code § 39-408
There is hereby established within the state of Idaho seven (7) public health districts more particularly defined as follows:
District No. 1 shall include the counties of Boundary, Bonner, Kootenai, Benewah and Shoshone;
District No. 2 shall include the counties of Latah, Clearwater, Nez Perce, Lewis and Idaho;
District No. 3 shall include the counties of Adams, Washington, Payette, Gem, Canyon and Owyhee;
District No. 4 shall include the counties of Valley, Boise, Ada and Elmore;
District No. 5 shall include the counties of Camas, Blaine, Gooding, Lincoln, Jerome, Minidoka, Twin Falls and Cassia;
District No. 6 shall include the counties of Power, Oneida, Bannock, Franklin, Caribou, Bear Lake, Bingham and Butte;
District No. 7 shall include the counties of Lemhi, Custer, Clark, Jefferson, Bonneville, Teton, Madison and Fremont.
Idaho Code § 39-408